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Re: st: not concave Poisson estimation


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: not concave Poisson estimation
Date   Fri, 10 Sep 2010 11:59:46 +0000 (GMT)

--- On Fri, 10/9/10, Estrella Gomez wrote:
> Now I have changed the specification, since there is no
> variation over importer and exporter. 
> 
> xtpoisson depvar indepvars i.year, re
> 
> However, I still have the same problem.

As always with these kinds of problems start simple. In
such a case I would just start without any indepvars or
year. After that add your variables one by one. Than you
have a more concrete idea what variables are causing your
problem (my suspicion is i.year in combination with some
of your (virtually) time constant indepvars). 

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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